S23645

Baltic Sea Flight 1930 - very rare postcard with high valuable Switzerland airmail stamps mixed franking, cancelled Romanshorn 11.VIII.30 sent via Friedrichshafen and carried by airship on it' s Baltic Sea Flight dropped at Tallinn (arrival postmark). The card was sent back via Berlin (red airmail arrival postmark) to Zurich (arrival postmark), very good quality, Sieger 88 B CH, Michel Zeppelin specialized catalogue 128 III CH